Do not wet hands before service. Use waterless sanitizers.No oils or moisturizers day of service! Or sanitize 2x to dry nails completely.Nailogic "Nail Sanitizer", and any other sanitizer must be completely dried from surface of nail.Do not touch nail surface with fingers or thumb!

Nail not properly etched

Use 100 grit file only. Etch well into sides and cuticle area. Use some pressure, test your results. If you cannot feel the etch marks, definitely, you need to etch with more pressure.

Insufficient time under U.V. Light

Be certain your gel UltraViolet light bulb is good. If the gel has not cured under the light within 2 minutes if the gel is clear, 3 minutes if a white gel, your bulb is tired.Maybe a timer would be a good idea.